Wrench



S. J. NORDSTROM.

WRENCH.

APPLICATION FILED NOV; I0, I920.

Patented Dec. 20, 1921.

IAUQQGSQ WRENCH.

Specification of Letters Patent.

Patented Dec. 22, 1921..

Application filed November 10, 1920. Serial No. 422,987.

To all wiwm it may concern:

Be it known that I, SVEN JonAN Nonn- STROM, a subject of the King of Sweden, and a resident of San Francisco, in the county of San Francisco and State of California, have invented certain new and usefu. Improvements in Wrenches, of which the following is a specification.

The present invention relates to wrenches, and more particularly to an improvement in the wrench shown, described and claimed in my Patent No. 1,360,670, dated November 30, 1920.

The function of the wrench shown in the patent is to operate a turnable member having a relatively movable part, where at times it is desirable or necessary to move or adjust the movable part relatively to the turnable member, and where at other times it is desirable or necessary to turn the member and part without relative movement be tween them. The wrench is described in the patent as adapted for operating a valve having a lubricating screw. The screw is shown as an ordinary set screw with notches provided on the edges of the thread so that it may be moved relatively to the valve stem to lubricate the valve. The screw is shown as provided with a right hand thread and the wrench is so constructed that each time the wrench is manipulated to close the valve the screw is turned relatively to the valve and thereby lubricates it.

One object of the present invention is to simplify the construction and arrangement of parts of the above type of wrench so that it may be manufactured more cheaply without impairing its eiiiciency. Another object of the invention is to produce a wrench of such construction that on the manipulation of the wrench to open a Valve having a lubricating screw, the screw will be turned relatively to the valve and thereby lubricate the valve during the opening movement thereof. These and other objects of the invention are accomplished by the improved wrench described in the following specification and particularly pointed out in the appended claims.

In the accompanying drawings illustrating the preferred form of the invention, Figure 1 is a plan of the improved wrench; and Fig. 2 is a longitudinal section, partly in side elevation, through the wrench shown in Fig. 1.

The improved wrench as illustrated in the drawings comprises a head member 5 having means for engaging the turnable member or valve stem 6, and a handle 7 having means for engaging the relatively movable part or lubricating screw 8. The head member 5 comprises a down turned socket 9 which engages the upper squared end 10 of the valve stem 6, and a longitudinally-arranged, elongated socket 12 which loosely receives the forward end of the bandle 7. The head member 5 is securely fastened to the squared upper end and the valve stem 6 by means of a set screw 13. The upper end of the screw 8 projects upwardly through a hole 11 in the head memher 5. By reference to Fig. 1 it will be seen that the valve stem engaging socket 9 1s provlded with an eight-cornered hole 15. This construction enables the wrench to cocupy difi'erent operative positions with respect to the pipe in which the valve is located. It will be further observed by reference to Fig. 1 that the side walls 16 of the elongated handle receiving socket 12 are so arranged that the forward end 17 of the handle 7 may move freely laterally. The handle 7 in the construction shown in the drawings is pivoted to the socket 12 on the pin 18. The walls 16 of the handle receivlng socket are contracted at the oppositely disposed points 20 and 21 in the rear end of the socket so that as the handle is turned on the pivoted pin 18 to turn the valve the points 20 and 21 act as fulcra.

The forward end 17 of the handle is provided with a longitudinally disposed slot 22 which loosely receives a pawl 23, the toothed forward end 24 of which is adapted to engage one or another of the teeth or notches 25 of the lubricating screw 8. By reference to Fig. 2, it will be observed that these teeth or notches do not extend the full length of the screw. This is to prevent the compressed lubricant from escaping upwardly through the notches. The pawl 23 is yieldingly pressed into engagement with the teeth 25 of the screw 8 by means of a spring 27 the forward end of which encircles the shank 28 of the pawl and the rear end of which takes against the bottom 29 of the slot 22. The pawl 23 is provided with a pin 31 so that the pawl may be disengaged from the teeth 25 of the screw 8 when it is desired to remove the lubricating screw from the valve stem. The pin 31 also prevents the pawl 23 from falling out of the handle when the wrench is disengaged from the valve stem. The pin 31 projects upwardly through a hole 32 in the upper surface of the socket 12. The hole 32 is made sufiiciently large so as not to interfere with the lateral play of the forward end of the handle 7 when the wrench is manipulated to operate the valve.

The mode of operation of the improved wrench is as follows :-A movement of the wrench ina a counterclockwise direction through an angle of substantially ninety degrees will open the valve. During the first part of this movement the handle moves relatively to the head member 5, pivoting on the pin 18. This relative movement between the handle 7 and head member 5 causes the pawl 23 to turn the lubricating screw 8 through an arc subtended by one of the teeth 25 of the screw. The valve is thus lubricated at the beginning of its opening movement. At the end of the screw-turning movement, the handle 7 takes up against the fulcrum point 21 and during the remainder of the counter-clockwise movement of the handle in opening the valve, the valve and screw 8 are turned without relative movement between them. The valve isv closed by a movement of the wrench in a clockwise direction. During the first part of this movement the handle 7 moves relatively to the head member 5 until the handle takes up against the fulcrum point 20 and the pawl 23 rides up over and into engagement with the front side or face of next succeeding tooth on the periphery of the screw 8. During the remainder of the closing movement of the wrench, the valve and the screw 8 turn together without relative movement between them.

Having thus described the invention, what is claimed is 1. A wrench for operating a turnable mem ber provided with a relatively movable part,

comprising a handle having means for engaging the relatively movable part and a head member provided with a socket for engaging the turnable member and a socket in which the handle is loosely mounted so that when the handle is turned the relatively movable part may be moved relatively to the turnable member.

2. A wrench for operating a turnable member provided with a relatively movable part, comprising means for engaging the turnable member and means for engaging the rela- -tively movable part, the two means being pressed pawl for engaging the ratchet teeth.

4. A wrench for operating a valve having a stem and provided with a screw having ratchet teeth, comprising a head member consisting of a socket for engaging the valve stem and a handle socket, a handle loosely mounted in the handle socket,cand a spring pressed pawl mounted on the handle for engaging the ratchet teeth.

5. wrench for operating a, valve having a stem and provided with a screw having ratchet teeth, comprisin a head member having a socket for engaging the valve stem, a handle loosely mounted in the head member to permit relative -movement between them so that the screw may be turned relatively to the valve stem, and a pawl mounted. on the handle for engaging the ratchet teeth.

SVEN JOHAN NORDSTROM. 

